/*
 *
 * (c) Copyright Ascensio System Limited 2010-2018
 *
 * This program is freeware. You can redistribute it and/or modify it under the terms of the GNU 
 * General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html). 
 * In accordance with Section 7(a) of the GNU GPL its Section 15 shall be amended to the effect that 
 * Ascensio System SIA expressly excludes the warranty of non-infringement of any third-party rights.
 *
 * THIS PROGRAM IS DISTRIBUTED WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY OR
 * FITNESS FOR A PARTICULAR PURPOSE. For more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
 *
 * You can contact Ascensio System SIA by email at sales@onlyoffice.com
 *
 * The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display 
 * Appropriate Legal Notices, as required under Section 5 of the GNU GPL version 3.
 *
 * Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains 
 * relevant author attributions when distributing the software. If the display of the logo in its graphic 
 * form is not reasonably feasible for technical reasons, you must include the words "Powered by ONLYOFFICE" 
 * in every copy of the program you distribute. 
 * Pursuant to Section 7 § 3(e) we decline to grant you any rights under trademark law for use of our trademarks.
 *
*/


#region usings

using System.Diagnostics;
using System.Text;
using ASC.Common.Data.Sql.Expressions;

#endregion

namespace ASC.Common.Data.Sql
{
    [DebuggerTypeProxy(typeof(SqlDebugView))]
    public class SqlDelete : ISqlInstruction
    {
        private readonly string table;
        private Exp where = Exp.Empty;

        public SqlDelete(string table)
        {
            this.table = table;
        }

        #region ISqlInstruction Members

        public string ToString(ISqlDialect dialect)
        {
            var sql = new StringBuilder();
            sql.AppendFormat("delete from {0}", table);
            if (where != Exp.Empty) sql.AppendFormat(" where {0}", where.ToString(dialect));
            return sql.ToString();
        }

        public object[] GetParameters()
        {
            return where != Exp.Empty ? where.GetParameters() : new object[0];
        }

        #endregion

        public SqlDelete Where(Exp where)
        {
            this.where = this.where & where;
            return this;
        }

        public SqlDelete Where(string column, object value)
        {
            return Where(Exp.Eq(column, value));
        }

        public override string ToString()
        {
            return ToString(SqlDialect.Default);
        }
    }
}